I've seen this type of result before, but it's worth reiterating. "Registered users make two-thirds (67%) of attacks on English Wikipedia, contradicting a widespread assumption that anonymity is the primary contributor to the problem." The other two observations are also consistent with my own experience of Wikipedia (and speak to why I don't get myself involved in editing Wikipedia documents): "Only 18% of attacks were followed by a warning or a block of the offending user" and "While half of all attacks come from editors who make fewer than 5 edits a year, a third come from registered users with over 100 edits a year."
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